Rand-trimmer



(No Model.)

J. W. PLUMMER.

RAND TRIMMER.

No. 416,011. Patented Nov. 26, 1889.

WITNESSES: i /flmm/ N. PETERS, Phmn-uum n mr. Washihgton. n. c.

UNITED STATES PATENT OFFICE.

JOHN \V. PLUMMER, OF SOMERVILLE, ASS IGNOR TO THE ACME HEEL TRIMMER COMPANY, OF BOSTON, MASSACHUSETTS.

RAN D-TRIMMER.

SPECIFICATION forming part of Letters Patent No. 416,011, dated. November 26, 1889.

Application filed July 11, 1889.

To all whom it may concern.-

Be it known that 1, JOHN W. PLUMMER, of Somerville, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Ranch Trimmers, of which the following is a specification.

This invention relates to rotary trimmers or cutter-heads for trimming the rand and heel-seat portions of boot and shoe heels; and it has for its object to provide a rand-trimmer of simple construction in which the cutters shall be readily loosened from the head or body for grinding and readily adjusted to their operative positions after grinding without the necessity of mechanical skill on the part of the operator, the cutters being of such form that they can be ground by a person of ordinary intelligence and not necessarily by a skilled mechanic.

The invention consists in a rand-trimmer composed of a head or collar, a series of cutters pivoted thereto so that their cuttingedges may be swung out from the periphery of said head to expose said edges to a grinder, and a clamp whereby the cutters may be confined in their operative positions.

The invention also consists in the provision of reciprocal shoulders on the head and cutters, whereby the proper position of the knives with relation to the periphery of the collar may be readily determined before they are clamped or secured.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a side elevation of my improved rand-trimmer, the guard or end cap thereof being removed. Fig. 2 represents a section on line 00 m, Fig. 1. Fig. 3 represents a perspective view of one of the cutters. Fig. 4 represents a side View of one of the cutters.

The same letters of reference indicate the same parts in all of the figures.

In the drawings, a represents the circular plate or head, and I) Z) I) represent the cutters, each of which is connected near one end to the head by a pivot 19.

Each cutter is composed of a flat base 2, which bears on one side of the head a, and is connected thereto by the pivot p and a beveled segmental flange 3, provided at itsouter edge Serial No. 317,186. (No model.)

being placed against the side of a grindingwheel for this purpose.

The cutters are pivoted at the rear or heel ends of their bases to the head, and the pivot-s p are so arranged that when the outer apexes of the cutting-edges are n their proper relation to the periphery of the head athat is, just coinciding with said peripherythe heel ends will be sufficiently inside of said periphery to give the cutters the requisite clearance. For the purpose of determining the proper position of the cutters I provide the base of each cutter with a shoulder 6, arranged to bear on an annular shoulder 7 on the head a when the knives are in the proper position, said shoulders preventing the knives from being moved outwardly from their proper positions without loosening the clamp hereinafter described.

The cutters are secured to the head when in operation by a clamp composed of a flange (Z on a sleeve (1', said flange bearing on the bases of the cutters, while the sleeve passes through a central hole in the head a, and is secured by a nut e, screwed onto its threaded periphery andbearing,whenturned up,against the rear side of the head, as shown in Fig. 2.

The clamp may be rotated to confine or release the cutters by means of a spanner engaged with holes on m, formed in the flange (Z.

When it is desired to grind the cutters, the clamp is loosened and the cutters are swung outwardly, as shown by dotted lines in Fig. 1, thus exposing their cutting-edges, so that they may be readily presented to a grindstone or emery-wheel without removing them from thehead a. After grinding, the cutters are turned back to place, adjusted by the shoulders 6 7, and then secured by the clamp.

It will be seen that this device is very simple, and that the operations of preparing the cutters for grinding and restoring them to their operative position, as well as of grinding the cutters, may be performed by an ordinary shoe-factory operative.

I claim 1. The combination, in a randtrimmer, of the head having the annular shoulder 7, the cutters composed of the flanges and the Hat bases 2, pivoted to the head a,a11d having the segmental shoulders 6 formed to bear against the annular shoulder 7 of the head, and a clamp adapted to detachably secure said bases to the head, as set forth.

2. The combination of the head at, having a central aperture, the cutters composed of the bases 2, bearing on and pivoted to said head, and the flanges 3 on said bases, and the clamp composed of the threaded sleeve d,

passing through the aperture of the head, the flange (Z on said sleeve, and the securing-nut 15 e on the threaded portion of the sleeve, asset forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing Witnesses, this 5th day of July, 20 A. I). 1889.

JOHN W. PLVMMER.

Witnesses:

O. F. BROWN, ARTHUR W. CRossLEY. 

